[
  {
    id: 1,
    label: "一级 1",
    children: [
      {
        id: 4,
        label: "二级 1-1",
        children: [
          {
            id: 9,
            label: "三级 1-1-1",
          },
          {
            id: 10,
            label: "三级 1-1-2",
          },
        ],
      },
    ],
  },
  {
    id: 2,
    label: "一级 2",
    children: [
      {
        id: 5,
        label: "二级 2-1",
      },
      {
        id: 6,
        label: "二级 2-2",
      },
    ],
  },
  {
    id: 3,
    label: "一级 3",
    children: [
      {
        id: 7,
        label: "二级 3-1",
      },
      {
        id: 8,
        label: "二级 3-2",
        children: [
          {
            id: 11,
            label: "三级 3-2-1",
          },
          {
            id: 12,
            label: "三级 3-2-2",
          },
          {
            id: 13,
            label: "三级 3-2-3",
          },
        ],
      },
    ],
  },
]